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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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eefd95e1f3
When timer_create() fails on a bootime or realtime clock, setup_timer() returns 0 as if timer has been set. Callers wait forever for the timer to expire. This hang is seen on a system that doesn't have support for: CLOCK_REALTIME_ALARM ABSTIME missing CAP_WAKE_ALARM? : [UNSUPPORTED] Test hangs waiting for a timer that hasn't been set to expire. Fix setup_timer() to return 1, add handling in callers to detect the unsupported case and return 0 without waiting to not fail the test. Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
284 lines
6.5 KiB
C
284 lines
6.5 KiB
C
/* set_timer latency test
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* John Stultz (john.stultz@linaro.org)
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* (C) Copyright Linaro 2014
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* Licensed under the GPLv2
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*
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* This test makes sure the set_timer api is correct
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*
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* To build:
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* $ gcc set-timer-lat.c -o set-timer-lat -lrt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <time.h>
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#include <string.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <pthread.h>
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#include "../kselftest.h"
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#define CLOCK_REALTIME 0
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#define CLOCK_MONOTONIC 1
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#define CLOCK_PROCESS_CPUTIME_ID 2
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#define CLOCK_THREAD_CPUTIME_ID 3
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#define CLOCK_MONOTONIC_RAW 4
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#define CLOCK_REALTIME_COARSE 5
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#define CLOCK_MONOTONIC_COARSE 6
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#define CLOCK_BOOTTIME 7
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#define CLOCK_REALTIME_ALARM 8
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#define CLOCK_BOOTTIME_ALARM 9
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#define CLOCK_HWSPECIFIC 10
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#define CLOCK_TAI 11
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#define NR_CLOCKIDS 12
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#define NSEC_PER_SEC 1000000000ULL
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#define UNRESONABLE_LATENCY 40000000 /* 40ms in nanosecs */
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#define TIMER_SECS 1
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int alarmcount;
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int clock_id;
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struct timespec start_time;
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long long max_latency_ns;
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int timer_fired_early;
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char *clockstring(int clockid)
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{
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switch (clockid) {
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case CLOCK_REALTIME:
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return "CLOCK_REALTIME";
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case CLOCK_MONOTONIC:
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return "CLOCK_MONOTONIC";
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case CLOCK_PROCESS_CPUTIME_ID:
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return "CLOCK_PROCESS_CPUTIME_ID";
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case CLOCK_THREAD_CPUTIME_ID:
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return "CLOCK_THREAD_CPUTIME_ID";
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case CLOCK_MONOTONIC_RAW:
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return "CLOCK_MONOTONIC_RAW";
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case CLOCK_REALTIME_COARSE:
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return "CLOCK_REALTIME_COARSE";
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case CLOCK_MONOTONIC_COARSE:
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return "CLOCK_MONOTONIC_COARSE";
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case CLOCK_BOOTTIME:
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return "CLOCK_BOOTTIME";
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case CLOCK_REALTIME_ALARM:
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return "CLOCK_REALTIME_ALARM";
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case CLOCK_BOOTTIME_ALARM:
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return "CLOCK_BOOTTIME_ALARM";
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case CLOCK_TAI:
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return "CLOCK_TAI";
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};
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return "UNKNOWN_CLOCKID";
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}
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long long timespec_sub(struct timespec a, struct timespec b)
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{
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long long ret = NSEC_PER_SEC * b.tv_sec + b.tv_nsec;
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ret -= NSEC_PER_SEC * a.tv_sec + a.tv_nsec;
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return ret;
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}
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void sigalarm(int signo)
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{
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long long delta_ns;
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struct timespec ts;
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clock_gettime(clock_id, &ts);
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alarmcount++;
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delta_ns = timespec_sub(start_time, ts);
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delta_ns -= NSEC_PER_SEC * TIMER_SECS * alarmcount;
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if (delta_ns < 0)
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timer_fired_early = 1;
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if (delta_ns > max_latency_ns)
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max_latency_ns = delta_ns;
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}
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void describe_timer(int flags, int interval)
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{
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printf("%-22s %s %s ",
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clockstring(clock_id),
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flags ? "ABSTIME":"RELTIME",
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interval ? "PERIODIC":"ONE-SHOT");
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}
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int setup_timer(int clock_id, int flags, int interval, timer_t *tm1)
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{
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struct sigevent se;
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struct itimerspec its1, its2;
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int err;
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/* Set up timer: */
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memset(&se, 0, sizeof(se));
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se.sigev_notify = SIGEV_SIGNAL;
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se.sigev_signo = SIGRTMAX;
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se.sigev_value.sival_int = 0;
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max_latency_ns = 0;
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alarmcount = 0;
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timer_fired_early = 0;
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err = timer_create(clock_id, &se, tm1);
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if (err) {
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if ((clock_id == CLOCK_REALTIME_ALARM) ||
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(clock_id == CLOCK_BOOTTIME_ALARM)) {
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printf("%-22s %s missing CAP_WAKE_ALARM? : [UNSUPPORTED]\n",
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clockstring(clock_id),
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flags ? "ABSTIME":"RELTIME");
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/* Indicate timer isn't set, so caller doesn't wait */
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return 1;
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}
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printf("%s - timer_create() failed\n", clockstring(clock_id));
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return -1;
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}
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clock_gettime(clock_id, &start_time);
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if (flags) {
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its1.it_value = start_time;
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its1.it_value.tv_sec += TIMER_SECS;
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} else {
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its1.it_value.tv_sec = TIMER_SECS;
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its1.it_value.tv_nsec = 0;
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}
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its1.it_interval.tv_sec = interval;
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its1.it_interval.tv_nsec = 0;
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err = timer_settime(*tm1, flags, &its1, &its2);
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if (err) {
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printf("%s - timer_settime() failed\n", clockstring(clock_id));
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return -1;
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}
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return 0;
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}
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int check_timer_latency(int flags, int interval)
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{
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int err = 0;
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describe_timer(flags, interval);
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printf("timer fired early: %7d : ", timer_fired_early);
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if (!timer_fired_early) {
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printf("[OK]\n");
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} else {
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printf("[FAILED]\n");
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err = -1;
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}
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describe_timer(flags, interval);
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printf("max latency: %10lld ns : ", max_latency_ns);
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if (max_latency_ns < UNRESONABLE_LATENCY) {
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printf("[OK]\n");
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} else {
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printf("[FAILED]\n");
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err = -1;
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}
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return err;
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}
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int check_alarmcount(int flags, int interval)
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{
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describe_timer(flags, interval);
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printf("count: %19d : ", alarmcount);
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if (alarmcount == 1) {
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printf("[OK]\n");
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return 0;
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}
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printf("[FAILED]\n");
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return -1;
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}
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int do_timer(int clock_id, int flags)
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{
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timer_t tm1;
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const int interval = TIMER_SECS;
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int err;
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err = setup_timer(clock_id, flags, interval, &tm1);
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/* Unsupported case - return 0 to not fail the test */
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if (err)
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return err == 1 ? 0 : err;
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while (alarmcount < 5)
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sleep(1);
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timer_delete(tm1);
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return check_timer_latency(flags, interval);
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}
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int do_timer_oneshot(int clock_id, int flags)
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{
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timer_t tm1;
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const int interval = 0;
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struct timeval timeout;
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int err;
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err = setup_timer(clock_id, flags, interval, &tm1);
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/* Unsupported case - return 0 to not fail the test */
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if (err)
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return err == 1 ? 0 : err;
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memset(&timeout, 0, sizeof(timeout));
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timeout.tv_sec = 5;
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do {
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err = select(0, NULL, NULL, NULL, &timeout);
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} while (err == -1 && errno == EINTR);
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timer_delete(tm1);
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err = check_timer_latency(flags, interval);
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err |= check_alarmcount(flags, interval);
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return err;
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}
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int main(void)
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{
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struct sigaction act;
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int signum = SIGRTMAX;
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int ret = 0;
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/* Set up signal handler: */
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sigfillset(&act.sa_mask);
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act.sa_flags = 0;
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act.sa_handler = sigalarm;
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sigaction(signum, &act, NULL);
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printf("Setting timers for every %i seconds\n", TIMER_SECS);
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for (clock_id = 0; clock_id < NR_CLOCKIDS; clock_id++) {
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if ((clock_id == CLOCK_PROCESS_CPUTIME_ID) ||
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(clock_id == CLOCK_THREAD_CPUTIME_ID) ||
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(clock_id == CLOCK_MONOTONIC_RAW) ||
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(clock_id == CLOCK_REALTIME_COARSE) ||
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(clock_id == CLOCK_MONOTONIC_COARSE) ||
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(clock_id == CLOCK_HWSPECIFIC))
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continue;
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ret |= do_timer(clock_id, TIMER_ABSTIME);
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ret |= do_timer(clock_id, 0);
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ret |= do_timer_oneshot(clock_id, TIMER_ABSTIME);
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ret |= do_timer_oneshot(clock_id, 0);
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}
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if (ret)
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return ksft_exit_fail();
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return ksft_exit_pass();
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}
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